KR20090091462A - Slab turning apparatus and method for rolling slab using the same - Google Patents

Abstract

A slab turning device and a slab rolling method using the same are provided to comprise a rolling line efficiently by arranging the rolling line on a desired location, and to minimize damage of the slab surface. A slab turning device(100) comprises a turning device body(110), a slab lifting part, a rotating part(140), a clamping part(150), and a roller controlling part. The slab lifting part is operated by a conveyor roller by transferring slab to a vertical direction. The rotating part changes an arrangement direction of the lifted slab. The clamping part is mounted on the rotating part. The clamping part is comprised to hole the slab. The roller controlling part controls driving of the conveyor roller.

Description

SLAB TURNING APPARATUS AND METHOD FOR ROLLING SLAB USING THE SAME}

The present invention relates to a slab turning device and a slab rolling method using the same for quickly turning the slab so that the transfer of the slab fed into the rolling mill is not delayed.

In general, the hot thick plate rolling process, as shown in Fig. 1, is a broadside rolling process for adjusting the width of the slab 1, which is a rolled material, to a target width, and the slab is rotated by 90 ° after the rolling process. It is divided into longitudinal rolling process that rolls up to the thickness of the product.

Since the slab 1 subjected to this width rolling is rotated by 90 °, the length of the slab 1 is in the width direction ('Y' direction in FIG. 1), and the width of the slab 1 is in the longitudinal direction (FIG. 1 '(X' direction), that is, the rolling direction (arrow direction indicated at the center of the slab).

On the other hand, in FIG. 2, the thick plate rolling line which performs such slab width rolling is shown.

That is, as shown in Figure 2, the slab 1 extracted in the heating furnace 10 is the surface scale is removed by the descaling device 20, the conventional turning via the roller table 30 which is the slab feed table Reach the table 50.

Therefore, the slab 1 is rotated clockwise or counterclockwise in the turning table 50 at the (mill) rolling mill 40 entrance side, and the width and length direction thereof are changed as shown in FIG. 1 and rolled through the rolling mill 40. .

Next, the slab 1 which is turned and primary rolled again at the turning table 50 on the rolling mill exit side is turned again, and thus the slab is turned and rolled in the initial longitudinal direction. In this case, the roughing mill may be a reversible-non-angular rolling mill, and if the reversible rolling mill, the rolling mill exiting turning table 50 in FIG.

For example, in the case of a thick plate material (thick steel plate), since the width is about 1500 to 4500mm compared to the general hot rolled material, the width and length direction are changed by turning the slab 1 at the inlet side of the roughing mill, and the width becomes the length. The length became the width and rolling was performed.

Therefore, since the rolling material is stretched in the longitudinal direction due to the rolling characteristics, when the slab length is increased in the rough rolling process after turning by the amount corresponding to the target width, the rough steel plate (thick steel plate) having the target width is completed by turning the rough rolling and turning again. First rolling production.

On the other hand, the turning table 50 known as shown in Figure 2, although schematically shown in the drawing, a plurality of turning rolls 51, 52 in the longitudinal direction is rotatably provided on the table body installed at the inlet and outlet of the rolling mill independently .

The turning rolls 51 and 52 are tapered in the longitudinal direction (indicated by 'T'), and thus, when the rolls are rotated while the rotation directions of the turning rolls 51 and 52 are different from each other, as shown in FIG. Rotates clockwise or counterclockwise.

However, such a conventional turning table 50 for heavy plate width rolling is not suitable for high-speed production, that is, high-speed rolling of the products of the steel mill's most concern at present.

For example, as shown in FIG. 2, since the conventional turning table 50 is disposed at the inlet and outlet sides of the rolling mill 40, the slab requires a period of turning the slab before the mill is put in, thus making high-speed rolling difficult. . In other words, the idle time that the slab is not continuously input to the rolling mill is generated. As a result, the conventional turning table 50 is a situation that causes a delay of the slab rolling process.

In addition, since the conventional turning table 50 operates the tapered turning rolls 51 and 52, a manual operation of an operator is often required during actual slab turning, and thus the operating time of the turning table itself may be easily delayed. .

As a solution to this problem, conventionally, as shown in Fig. 3, the Japanese hot thick steel slab turning method has two slab turning devices 12 mounted on the slab turning device 12 when the slab after the extraction of the furnace is on a designated feed roll. The crane 40 provided with the tongs 53 comes down, grabs the slab H, lifts it up and rotates it, and then puts the slab down on the feed roll A and separates the crane from the slab. It is then transferred to the roughing mill and the crane moves to the designated location on the top.

In this case, since the crane system is used, the pressure to hold the slab in the barrel crane must be adjusted according to the weight and size of the thick steel slab.

In addition, when holding the side of the slab in the crane, the side shape of the slab may be damaged, the problem that the failure of the slab can not be cured even by rolling.

In addition, in the case of the crane, there is a disadvantage that it is difficult to prepare when the slab slips during the rotation of the slab.

The present invention is made by recognizing at least one of the needs or problems occurring in the conventional slab turning apparatus as described above.

One object of the present invention is to prevent the rolling process is delayed by making the turning process of the slab quickly.

Another object of the present invention is to minimize the damage to the surface of the slab by the turning device when turning the slab.

Yet another object of the present invention is to make it possible to turn slabs of various sizes, temperatures and weights.

Another object of the present invention is to stop exactly at the position where the slab is rotated, and to minimize the obstacles caused by the stop driving.

Another object of the present invention is to minimize the obstacles caused by the eccentric load generated during the lifting operation of the slab for the rotation of the slab.

The present invention is basically based on being configured such that the driving for lifting the slab and the driving for clamping and rotating the slab can be made independently so that the turning process of the slab can be made quickly.

A slab turning device according to an embodiment of the present invention includes a turning device body; A slab lifting unit mounted on the turning device main body and configured to move the slab in a vertical direction and to lift and lower the slab from the feed roller; A rotating part mounted to the turning apparatus main body in a structure independent of the lifting part and rotating to change the arrangement direction of the slab lifted by the slab lifting part; A clamping portion mounted to the rotating portion and configured to pick up the slab for rotation of the slab lifted by the lifting portion; It may be configured to include a roller drive control unit for controlling the drive of the feed roller so that the slab conveyed by the feed roller can be stopped at the position of the slab lifting portion.

In this case, the roller driving control unit includes a detection roller which is disposed together with the feed roller so as to allow free rotation and is pressed by the load of the slab; It may be configured to include a control switch disposed at at least one end of the detection roller to send a signal to the control unit to stop the operation of the feed roller by the detection roller pressed by the slab. On the other hand, the control switch includes a main body constituting the control switch; A fixed contact terminal provided in the control switch main body; A movable contact terminal provided in the control switch main body to come into contact with the fixed contact terminal by pressing the detection roller; It may be configured to include an elastic member for supporting the movable contact terminal.

And, the slab lifting portion and the lifter is provided with a vertical conveying portion receiving the vertical conveying force by the lifting drive; A hanger connected freely to a lower portion of the lifter; It may be configured to include a seating portion connected to the hanger on which the slab is placed.

On the other hand, the rotating unit and the fixed body coupled to the main body; A rotating body rotatably coupled to the fixed body; It may be configured to include a rotating body driving unit for providing a rotational force with respect to the rotating body.

On the other hand, the clamping portion and the base coupled to the rotating portion; A pair of clampers mounted on the base and driven in a direction adjacent or away from each other so as to pick up the slab; It may be configured to include a clamper driving unit for providing a driving force to the clamper.

On the other hand, a vertical drive unit may be further provided between the rotating unit and the clamping unit so that the clamping unit may be configured to be lowered to secure a space for rotation of the slab. In this case, the vertical drive part may be configured to be a cylinder, one end of which is coupled to the support part freely rotatably coupled to the fixture, and the other end of the vertical drive part to be coupled to the base of the clamping part, to allow the clamping part to move up and down.

The clampers may be configured to form a pair in a direction facing the base so as to be slidable to the base, and may be configured to receive power from the clamper driver through the power transmission unit.

Slab rolling method according to another embodiment of the present invention comprises the steps of heating and extracting the slab in the heating furnace; Pre-turning the slab to prevent the input delay caused by the rolling mill inlet-side turning table operation by the slab turning device provided with the heated slab in one region of the rolling mill inlet-side feed roller; And, it may be made by including a slab rolling step of rolling the slab by transferring the turned slab directly to the rolling mill without the turning table in the rolling mill.

According to the present invention as described above, it is possible to prevent the rolling process is delayed by making the turning process of the slab quickly.

Further, according to the present invention, when turning the slab, it is possible to minimize the damage to the surface of the slab by the turning device.

And also according to the invention, it becomes possible to turn slabs of various sizes, temperatures and / or weights.

In addition, according to the present invention, the slab can be accurately stopped at the rotational position by detecting the moving position of the slab even in the working environment due to the cooling water for high heat and / cooling.

Further, according to the present invention, even when the conveyed slab is conveyed to the eccentric position in the width direction of the feed roller it can minimize the obstacles generated during the lifting operation for the rotation of the slab due to the eccentric load of the slab.

In addition, according to the present invention, since it can be disposed at a desired position in the slab transfer section between the heating furnace and the rolling mill, the device can be efficiently operated according to the rolling line configuration.

In addition, according to the present invention, it is possible to prevent the slab from being damaged due to the delay of the rolling process and / or the turning of the slab, thereby improving the quality of the final produced plate.

In order to help understand the features of the present invention as described above, it will be described in detail with respect to the slab turning device and the slab rolling method using the same according to the embodiment of the present invention.

Hereinafter, the described embodiments will be described based on the embodiments best suited for understanding the technical features of the present invention, and the technical features of the present invention are not limited by the described embodiments. It is intended to illustrate that the invention can be implemented as described embodiments. Accordingly, the present invention may be modified in various ways within the technical scope of the present invention through the embodiments described below, and such modified embodiments fall within the technical scope of the present invention. And, hereinafter, in order to help the understanding of the embodiments described, in the reference numerals described in the accompanying drawings, among the components that will have the same function in each embodiment is represented by the same or an extension line number.

Embodiments related to the present invention are basically based on being configured such that the driving for lifting the slab and the driving for clamping and rotating the slab can be independently performed so that the turning process of the slab can be made quickly. On the other hand, the direction is rotated by the turning device according to an embodiment of the present invention is not limited to the slab, for example, is transferred to the conveying roller, other plate-shaped material that is necessary to change the traveling position or the rolling position, namely The plate is all applicable.

Referring to an example of the slab turning device according to an embodiment of the present invention, as shown in Figure 4, the slab turning device 100 is capable of raising and lowering the slab 1 to the turning device main body 110. The slab lifting unit 120 and the clamping unit 150 is configured to pick up the slab (1) lifted by the slab lifting unit 120, and the slab picked up by the clamping unit 150 It may be configured to include a rotating unit 140 is configured to rotate the direction of (1). In this case, the configuration for the operation of the lifting unit 120 and the operation of the rotating unit 140 and the clamping unit 150 may be configured to perform independent operation.

On the other hand, the turning device main body 110 may be configured to be disposed in a fixed position relative to the feed roller 11 for transporting the slab (1), on the other hand, the turning device main body 110 is a transport rail 101 It may be configured to move the turning device 100 to the position of the feed roller 11 for transporting the slab (1) along.

In this case, the main body 110 may be provided with a conveying unit 111 to be movable along the conveying rail 10, the conveying unit 111 may be made of a simple driving wheel, or in the configuration such as the transport bogie It may be done. That is, the main body 110 may be configured by a transfer means generally known to be movable along the transfer rail 101.

In addition, the slab 1 may be conveyed to the position of the turning device 100 by a general feed roller 11, in which case the slab 1 conveyed by the feed roller 11 should be rotated. A configuration capable of controlling the driving of the feed roller 11 to be stopped at a position on the feed roller 11 can be made.

As an example of such a configuration, as illustrated in FIGS. 4 and 5, the roller driving controller 160 may be further provided. The roller drive control unit 160 may be configured to detect the position of the slab 1 based on mechanical operation. In this mechanical operation, the detection roller 161 in which no load (free rotation) is rotated is disposed at any one of the feed rollers 11 to be pressed downward by the load of the slab 1, and such detection is performed. The control switch 162 may be configured to transmit a signal to stop the operation of the feed roller 11 by the movement of the roller 161.

In order that the detection roller 161 can be pressed by the load of the slab 1, the detection roller 161 can be disposed at a position slightly higher than the height of the feed roller 11 for transporting the slab (1). Can be configured. In this case, the height of the detection roller 161 may be arranged at a level that does not damage the slab 1 to be transported, or the supporting force for supporting the detection roller 161 is sufficiently greater than the load of the slab 1. It may be configured so as to be formed small so as not to damage the slab (1).

An example of the configuration of the control switch 162 is a movable contact terminal 162b which is moved by the pressing action of the detection roller 161 inside the control switch main body 162a as shown in FIG. The fixed contact terminal 162c is formed by the operation of the movable contact terminal 162b, the movable contact terminal 162b may be configured to be supported by the elastic member 162d. In addition, the shaft 161a of the detection roller 161 is coupled to one end of the movable contact terminal 162b such that the rotation of the detection roller 161 can be performed in a no load state, and the arrangement state of the detection roller 161 is arranged. Support portion 162e that acts to maintain the may be provided.

With this configuration, when the detection roller 161 is pressed downward by the load of the slab 1, the movable contact terminal 162b makes contact with the fixed contact terminal 162c, and signals to the controller 170. Will be sent. By this operation, the controller 170 can stop the operation of the feed roller 11, so that the slab 1 can be stopped in the rotational position. In this case, it may be controlled by varying the stop time of the feed roller 11 through an appropriate calculation process according to the position of the detection roller 161.

In addition, the slab lifting part 120 provided in the main body 110 may be configured to raise and / or lower the slab 1 in the vertical direction. In this case, the slab lifting unit 120 may be configured not to pick up the slab 1, but to support the lower region (lower surface) of the slab 1 so as to raise or lower the slab.

The slab lifting unit 120 may be configured to allow the slab lifting unit 120 having a structure such as a plurality of bars (or rods) to be lowered in the vertical direction by the lifting driving unit 130. As such, in order to move up and down the slab lifting unit 120, the turning device main body 110 is provided with a lifting driving unit 130, and one end of the lifter 121 constituting the slab lifting unit 120 is provided. It is configured to be movable by the lifting drive unit 130 can be configured to enable the lifting and lowering of the slab lifting unit 120.

As an example of such a configuration, as shown in FIGS. 4 and 6, the slab lifting unit 120 is configured such that one end of the lifter 121 is mounted on the main body 110 and is movable upward and downward. Can be. That is, the lifter 121 may be configured to move up and down with respect to the main body 110 to enable the slab to move up and down.

A vertical conveying part 121a is formed at an end of the lifter 121 mounted to the main body 110, and a lifting driving part 130 that provides a driving force for lifting or lowering to the lifter 121 is provided at the main body 110. It may be provided. By this configuration, the vertical conveying part 121a is raised or lowered by the lifting driving part 130 so that the slab lifting part 120 can lift or lower the slab 1 from the conveying roller 11.

The vertical conveying part 121a may be configured to slide through the main body 110 by a bearing (not shown), and may be coupled up and down. On the other hand, the lifting drive unit 130 for providing power to the vertical transfer unit 121a is composed of a power generation unit 131 and the power transmission unit 132 to generate the power generated from the power generation unit 131 to the vertical transfer unit It can also be configured to be delivered to (121a).

In this case, one surface of the vertical transfer unit 121a is configured as a rack gear, and the power transmission unit 124 forms a gear unit 132c engaged with the rack gear so that power can be transmitted. It can also be configured. In addition, the power generator 131 may include a gear unit 131a and may be configured to engage with the gear unit 132a of the power transmission unit 124, and each gear unit 132a of the power transmission unit 124. 132c may be configured to be coupled to the shaft 132b. On the other hand, the shaft 132b may be mounted to enable the rotation of the no-load state by the position fixing unit 133 provided in the turning device main body 110. On the other hand, the configuration of the gear for the power transmission may be made of a configuration of another gear, such as a worm gear generally known.

In addition to the above configuration, the slab lifting unit 120 may be composed of generally known lifting and lowering driving means capable of driving up and down with respect to the main body 110.

On the other hand, the slab lifting portion 120 is provided with a plurality of seating portion 122 so that the free pendulum movement (movement such as swing) can be made in the lower region to lift the slab (1) Can be. The seating part 122 may be configured to be coupled in a rotatable structure such as a hinge 123 and a hinge that allow free pendulum movement to be coupled to the connection part 124 provided below the lifter 121. . And, the seating portion 122 may be configured to be inserted (positioned) in the area between the conveying rollers 11 for transporting the slab (1).

With this configuration, the seating portion 122 is located in the area between the feed rollers so that the slab 1 is placed in the upper position of the seating portion 122 when the slab 1 is transported by the feed rollers 11. You can do that. Therefore, the seating part 122 may be configured to be positioned at the same height as the transport rail 11 or lower than the transport rail 11 when the slab lifting part 120 is in the lowered state. .

As such, when the slab 1 extracted from the heating furnace (not shown) and conveyed by the conveying rail 11 is lifted upward from the conveying rail 11 by the slab lifting part 120, the clamping is performed. The slab 1 is clamped by the part 150, and the direction of the slab is changed by the rotating part 140.

In the configuration according to the example of the rotating unit 140, as shown in Figure 8, the rotating unit 140 is rotatable to the fixed body 141 and the fixed body 141 is coupled to the main body 110. It may be configured to include a rotating body 143 is coupled. In this case, the rotating body 143 may be configured to be easily rotated by a configuration such as the fixing body 141 and a bearing (not shown).

The fixing body 141 may further include a gear part 141a at a position of an end portion adjacent to the rotating body 143. On the other hand, the rotating body 143 is provided with a rotation driving unit 144 having a power transmission unit 144a, it can be configured to rotate the rotating body 143. That is, the rotation driving unit 144 is coupled to the rotating body 143 in a fixed state, the power transmission unit 144a by the operation of the rotation driving unit 144 is provided in the fixed body 141 It may be configured to move along the portion 141a to enable rotation of the rotating body 143. In addition to the configuration described above, the rotor drive unit 134 is configured to be rotatable by the rotary drive unit 144 provided with a power transmission unit 134a such as a pulley, or a power shear means such as a belt or a chain. May be

On the other hand, the rotor driving unit 144 may drive the rotor 143 to be rotated at a predetermined angle. In this case, the angle of rotation of the rotating body 143 by the rotating body driving unit 144 is an angle of changing the direction of the slab for rolling, it can be made to rotate in general 90 degrees, as described above in the rolling direction of the slab It may also be configured to be able to rotate at different angles.

The rotating body 143 may be provided with a clamping unit 150 for picking up the slab lifted by the slab lifting unit 120. In this case, the clamping unit 150 may be configured with a clamper 152 such that an action force for rotating the slab 1 may be provided with respect to the lower region of the slab 1. For example, a clamper 152 having a flat contact area with the lower surface of the slab may be provided so that the slab can be lifted by the clamper 152.

As an example of the configuration of the clamper 152, as shown in FIG. 9, the clamping unit 150 is one or more clampers 152 disposed to face each other on the base 151 coupled to the rotating unit 140 ) May be configured to move in a direction adjacent or away from each other. By this operation, the clamper 152 may be in a state in which the slab 1 is lifted again by the clamper 152, rather than a method of picking up the slab 1 lifted by the slab lifting unit 120. .

The clamper 152 may be mounted to the base 151 to be movable (sliding). In this case, the base 151 is provided with a guide part 153 such as a slit-shaped hole, for example, and the clamper 152 is mounted to the guide part 153 so as to be slidable. It may be configured to reciprocally slide in the central direction and the end direction of the 151.

On the other hand, for driving the clamper 152, the base 151 is provided with a clamper driver 154 may drive the clamper 152 to lift or place the slab. As an example of such a configuration, the clamper driving unit 154 may provide a driving force to reciprocate the clamper 152 along the guide unit 153 through the power transmission unit 155 as shown. In this case, the power transmission unit 155 may be configured as a shaft provided with a screw gear, the clamper 152 has a screw portion (or screw gear) corresponding to the screw gear formed in the power transmission unit 155. May be formed to be configured to enable transmission of power.

On the other hand, the clamper driving unit 154 may be composed of a power generating unit such as a cylinder. In this case, the clamper 152 is coupled to the rod of the cylinder, and the clamper 152 may be driven to lift or place the slab according to the driving of the cylinder.

The vertical driving part 146 may be further provided between the rotating part 140 and the clamping part 150 configured as described above. In this case, the support 145 is provided in the fixed body 141 to allow free rotation of the no-load state, and one end of the vertical driver 146 is coupled to the support 145, and the vertical driver 146 is provided. The other end of may be configured to couple to the base 151 of the clamping portion 150. For example, the vertical driver 146 may be formed of a driving means such as a cylinder.

On the other hand, when the vertical drive unit 146 is provided between the support unit 145 and the clamping unit 150 provided in the fixed body 141 as described above, the rotating body 143 is relative to the fixed body 141 It may be configured to enable the sliding drive to stretch in the longitudinal direction. That is, the rotating part 140 may be made to be sliding drive so that the rotating body 143 can be expanded and contracted in the longitudinal direction along with the rotational movement with respect to the fixed body 141.

By such a configuration, the vertical driving unit 146 can move the position of the clamping unit 150 to be moved to the upper, lower positions.

Therefore, when the clamping unit 150 lifts the slab 1 lifted by the slab lifting unit 120 again, the vertical driving unit 146 operates to raise the clamping unit 150. Thus, the slab 1 can be lifted further from the seating portion 122 of the slab lifting part 120, and in this state, the direction of the slab 1 can be rotated by the driving of the rotating part 140. have. As such, after the direction of the slab 1 is changed, the clamping part 150 is lowered by the operation of the vertical driving part 146 again so that the slab 1 is placed on the seating part 122 again.

By the above configuration, the slab heated in the heating furnace and conveyed through the conveying roller is rotated in the rolling direction required by the turning device, and the slab rotated in this way is conveyed to the rolling mill to be rolled.

On the other hand, the turning device 100 may be disposed in the region of the transfer roller disposed between the descaling device and the turning table provided on the inflow side of the rolling mill.

The slab turning device described above and the slab rolling method using the same are not limited to the embodiments, but the embodiments may be configured by selectively combining all or some of the embodiments so that various modifications may be made. May be

1 is a view showing a conventional slab turning process.

2 is a view showing a conventional slab rolling process.

3 is a view showing a conventional slab turning device.

Figure 4 is a perspective view schematically showing the configuration of a slab turning device according to an embodiment of the present invention.

5 is a cross-sectional view illustrating an example of a configuration of a control switch illustrated in FIG. 4.

6 is an enlarged perspective view showing an example of the configuration of the coupling relationship between the slab lifting unit and the lifting drive unit shown in FIG. 4.

FIG. 7 is a perspective view illustrating an example of a configuration of the slab lifting unit illustrated in FIG. 4.

8 is a front view schematically showing the configuration of a slab turning device according to an embodiment of the present invention.

9 is a partially enlarged view illustrating an example of a configuration of the clamping unit illustrated in FIG. 4.

Explanation of symbols on the main parts of the drawings

100 ... turning unit 110 ... main unit

111 ... conveying part 120 ... slab lifting part

121 ... lifter 121a ... vertical feed

122 ... seating 123 ... hanger

124 ... connections 130 ... lifting drive

131 ... power generation section 132 ... power transmission section

140 ... rotating part 141 ... fixed body

143 ... rotor 144 ... rotor drive

145 ... support 146 ... vertical drive

150 ... clamping part 151 ... base

152 ... clamper 153 ... guide part

154 ... clamper drive

Claims (10)

A turning device body; A slab lifting unit mounted on the turning device main body and configured to move the slab in a vertical direction and to lift and lower the slab from the feed roller; A rotating part mounted to the turning device main body in a structure independent of the lifting part and rotating to change an arrangement direction of the slab lifted by the slab lifting part; A clamping part mounted on the rotating part and configured to pick up the slab for rotation of the slab lifted by the lifting part; Slab turning device comprising a roller drive control unit for controlling the drive of the feed roller so that the slab conveyed by the feed roller can be stopped at the position of the slab lifting portion. The method of claim 1, wherein the roller driving control unit A detection roller disposed together with the feed roller to be freely rotated and provided to be pressed by a load of the slab; And a control switch which is disposed at at least one end of the detection roller and sends a signal to the control unit to stop the operation of the feed roller by the detection roller pressed by the slab. The method of claim 2, wherein the control switch A control switch body; A fixed contact terminal provided in the control switch main body; A movable contact terminal provided in the control switch main body to come into contact with the fixed contact terminal by pressing the detection roller; Slab turning device comprising an elastic member for supporting the movable contact terminal. According to claim 1, The slab lifting portion A lifter having a vertical conveying portion provided with a conveying force in the vertical direction by the lifting driving portion; A hanger connected freely to a lower portion of the lifter; Slab turning device comprising a seating portion connected to the hanger is placed on the slab. The method of claim 1, wherein the rotating unit A fixed body coupled to the turning device body; A rotating body rotatably coupled to the fixed body; Slab turning device comprising a rotating body drive for providing a rotational force with respect to the rotating body. The method of claim 1, wherein the clamping portion A base coupled to the rotating part; A pair of clampers mounted on the base and driven in a direction adjacent or away from each other to pick up the slab; Slab turning device comprising a clamper driving unit for providing a driving force to the clamper. The slab turning apparatus according to claim 1, wherein a vertical driving part is further provided between the rotating part and the clamping part, and the clamping part is configured to be lowered to secure a space for rotating the slab. 8. The slab turning apparatus according to claim 7, wherein the vertical driving unit is configured as a cylinder, one end of which is coupled to a support part freely rotatably coupled to the fixture, and the other end of which is coupled to the base of the clamping part. The slab turning device according to claim 6, wherein the clampers are configured to be paired in a direction facing the base so as to be slidably driven, and are configured to receive power from the clamper driver through a power transmission unit. Heating and extracting the slab in the furnace; The slab turning device according to any one of claims 1 to 9 provided in the heated slab in any one area of the rolling mill inlet-side feed roller to prevent the closing delay caused by the rolling mill inlet-side turning table operation. Preturning the slab; And, A slab rolling method using a slab turning device comprising a slab rolling step of transferring the turned slab directly to the rolling mill without rolling table operation in the rolling mill to roll the slab.

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